CN109103345B

CN109103345B - Display panel and display device

Info

Publication number: CN109103345B
Application number: CN201810938826.0A
Authority: CN
Inventors: 朱家柱; 袁山富; 彭涛; 周瑞渊
Original assignee: Wuhan Tianma Microelectronics Co Ltd
Current assignee: Wuhan Tianma Microelectronics Co Ltd
Priority date: 2018-08-17
Filing date: 2018-08-17
Publication date: 2021-03-05
Anticipated expiration: 2038-08-17
Also published as: CN109103345A

Abstract

The invention provides a display panel and a display device. The display panel includes a buffer layer disposed on a substrate, the buffer layer including an organic material; the metal layer is arranged on one side of the buffer layer, which is far away from the substrate, and comprises a plurality of metal leads; the display panel comprises a bending area, the buffer layer comprises a plurality of grooves in the bending area, and the metal leads are arranged in the grooves. The display device comprising the display panel can relieve the material stress on the bent and deformed metal lead.

Description

Display panel and display device

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of display, in particular to a display panel and a display device.

[ background of the invention ]

Currently, display technologies have penetrated various aspects of people's daily lives, and accordingly, more and more materials and technologies are used for display screens. Nowadays, the mainstream display screens mainly include liquid crystal display screens and Organic Light Emitting Diode (OLED) display screens. Compared with a liquid crystal display screen, the OLED display screen saves a backlight module which consumes most energy due to the self-luminous performance of the OLED display screen, so that the OLED display screen has the advantage of energy conservation; in addition, the OLED display screen also has the characteristic of flexibility and bendability, and the plurality of conducting layers which are sequentially formed on the flexible substrate comprise a thin film transistor driving array layer, an anode layer, an organic light emitting layer, a cathode layer and a thin film packaging layer by adopting the flexible substrate, so that the OLED display screen has excellent bendability.

Along with the more vigorous demand of users on the flexible bending or folding performance of display terminal products, the requirements on the stability and the bending resistance times of the flexible display products are higher and higher. However, the metal leads of the display panel are easily broken when repeatedly bent, resulting in poor display performance.

[ summary of the invention ]

In view of the above, the present invention provides a display panel, a display device and a method for manufacturing the display panel, so as to solve the above problems in the prior art.

In one aspect, the present invention provides a display panel, including a substrate, the display panel further including:

a buffer layer disposed on the substrate, the buffer layer comprising an organic material;

the metal layer is arranged on one side, away from the substrate, of the buffer layer and comprises a plurality of metal leads;

the display panel comprises a bending area, the buffer layer comprises a plurality of grooves, and the metal leads are arranged in the grooves.

Optionally, the display panel further comprises a bent front face; the metal lead comprises a first bottom edge and a second bottom edge which are in straight shapes; the length of the first bottom edge is greater than that of the second bottom edge; the first bottom edge is approximately parallel to the second bottom edge; the distance between the first bottom edge and the bent front face is smaller than the distance between the second bottom edge and the bent front face.

Optionally, the metal lead further comprises a first beveled edge and a second beveled edge in a straight shape; the first oblique edge and the second oblique edge are connected with the first bottom edge and the second bottom edge; the first bottom edge, the second bottom edge, the first bevel edge and the second bevel edge form a trapezoidal structure; the first bottom edge and the first bevel edge form a first included angle, and the first bottom edge and the second bevel edge form a second included angle; the first included angle and the second included angle are 20 degrees to 80 degrees.

Optionally, the length of the first oblique side is approximately equal to the length of the second oblique side; the first included angle is approximately equal to the second included angle.

Optionally, the length of the first oblique side is smaller than the length of the second oblique side; the first included angle is 10 to 60 degrees greater than the second included angle.

Optionally, the metal lead further includes a first oblique edge and a second oblique edge in the shape of circular arcs; the first bevel edge and the second bevel edge have approximately the same radian and curvature radius; the first oblique edge and the second oblique edge are connected with the first bottom edge and the second bottom edge; the first bottom edge, the second bottom edge, the first bevel edge and the second bevel edge form a symmetrical quadrilateral structure.

Optionally, the metal lead includes a first bottom edge, a second bottom edge, a first oblique edge, a second oblique edge, a third oblique edge, and a fourth oblique edge in a straight shape; the first bottom edge is parallel to the second bottom edge, the first oblique edge is parallel to the third oblique edge, and the second oblique edge is parallel to the fourth oblique edge; the first bevel edge is connected with the fourth bevel edge, the second bevel edge is connected with the third bevel edge, the first bevel edge and the second bevel edge are both connected with the first bottom edge, and the third bevel edge and the fourth bevel edge are both connected with the second bottom edge; the first bottom edge, the second bottom edge, the first bevel edge, the second bevel edge, the third bevel edge and the fourth bevel edge form a hexagonal structure; the first base and the included angle of the first bevel edge, the first base and the included angle of the second bevel edge, the second base and the included angle of the third bevel edge, the second base and the included angle of the fourth bevel edge are all obtuse angles.

Optionally, the bending region includes a first bending region and a second bending region, and a maximum bending curvature of the first bending region is greater than a maximum bending curvature of the second bending region; the metal lead comprises a first metal lead positioned in the first bending area and a second metal lead positioned in the second bending area; the first included angle or the second included angle of the first metal lead is a first angle; the first included angle or the second included angle of the second metal lead is a second angle; the first angle is less than the second angle.

Optionally, the bending region includes a first conductive layer and a second conductive layer, and a distance between the first conductive layer and the bending front surface is greater than a distance between the second conductive layer and the bending front surface; the metal leads comprise a third metal lead positioned on the first conductive layer and a fourth metal lead positioned on the second conductive layer; the first included angle or the second included angle of the third metal lead is a third angle; the first included angle or the second included angle of the fourth metal lead is a fourth angle; the third angle is less than the fourth angle.

Optionally, the metal leads include a fifth metal lead and a sixth metal lead, the cross-sectional area of the fifth metal lead being larger than the cross-sectional area of the sixth metal lead; the first included angle or the second included angle of the fifth metal lead is a fifth angle; the first included angle or the second included angle of the sixth metal lead is a sixth angle; the fifth angle is less than the sixth angle.

Optionally, the substrate is made of polyimide.

In another aspect, the present invention provides a display device comprising the display panel.

The technical scheme has the following beneficial effects: when the display panel is bent, the organic material of the buffer layer generates a total buffer force to act on the metal lead. If the grooves are arranged appropriately so that the total cushioning force is approximately equal in magnitude and opposite in direction to the material stress, the total cushioning force can counteract the material stress. Therefore, the material stress on the bent and deformed metal lead is relieved, and the metal lead is prevented from being broken due to the material stress.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 and fig. 2 are schematic cross-sectional views of a display panel 100 according to an embodiment of the invention when the display panel is not bent;

FIG. 3 is a schematic cross-sectional view of a display panel 100 when bent according to an embodiment of the present invention;

FIG. 4 is a schematic plan view of a display panel 100 according to an embodiment of the invention;

FIG. 5 is a schematic cross-sectional view of a display panel 500 in a bending region according to another embodiment of the invention;

FIG. 6 is a schematic cross-sectional view of a display panel 600 in a bending region according to another embodiment of the invention;

FIG. 7 is a schematic cross-sectional view of a display panel 700 in a bending region according to another embodiment of the invention;

FIG. 8 is a schematic cross-sectional view of a display panel 800 in a bending region thereof according to another embodiment of the invention;

FIG. 9 is a schematic cross-sectional view of a display panel 900 in a bending region thereof according to another embodiment of the invention;

fig. 10 is a schematic cross-sectional view of a display panel 1000 in a bending region according to another embodiment of the invention;

FIG. 11 is a diagram of a display device 1150 according to another embodiment of the present invention;

fig. 12A and 12B are schematic diagrams illustrating a method for manufacturing a display panel according to another embodiment of the invention.

[ detailed description ] embodiments

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

Fig. 1 and fig. 2 are schematic cross-sectional views of a display panel 100 without bending according to an embodiment of the invention. Fig. 3 is a schematic cross-sectional view of a display panel 100 when bent according to an embodiment of the invention. Fig. 4 is a schematic plan view of a display panel 100 according to an embodiment of the invention. As shown in fig. 1 to 4, the display panel 100 includes a substrate 10. The display panel 100 further includes: a buffer layer 120 disposed on the substrate 10, the buffer layer 120 including an organic material 121; a metal layer disposed on the buffer layer 120 and away from the substrate 10, the metal layer including a plurality of metal leads 110; the display panel includes a bending region, in which the buffer layer 120 includes a plurality of grooves 123, and the metal leads 110 are disposed in the grooves 123.

As shown in fig. 4, the metal layer of the display panel 100 includes a plurality of metal leads 110, and the metal leads 110 run parallel to the long side 140 of the display panel 100 and perpendicular to the short side 130 of the display panel 100. The display panel 100 may be bent around a bending axis 150. The bending axis 150 is parallel to the short side 130 and perpendicular to the long side 140. The metal leads 110 are perpendicular to the bending axis 150.

When the display panel 100 is bent around the bending axis 150, the metal leads 110 generate a material stress 107 acting on themselves, and the material stress 107 is directed to the substrate 10. The metal leads 110 are susceptible to fracture from material stress 107. If the material stress 107 is sufficient to cause the metal leads 110 to break, this makes the display panel 100 unable to display normally.

The display panel 100 of the embodiment of the invention includes a metal lead 110 and a buffer layer 120, wherein the buffer layer 120 includes a plurality of grooves 123, and the metal lead 110 is disposed in the grooves 123. The buffer layer 120 may relieve material stress to which the metal lead 110 is subjected. When the display panel 100 is bent around the bending axis 150, the organic material 121 of the buffer layer 120 generates a total buffer force 109 acting on the metal wires 110. If the groove arrangement is appropriate such that the total cushioning force 109 is approximately equal in magnitude and opposite in direction to the material stress 107, then the total cushioning force 109 may counteract the material stress 107. This relieves the material stress 107 to the bent and deformed metal lead 110, and prevents the metal lead 110 from being broken due to the material stress 107.

As shown in fig. 1, the display panel 100 further includes a bent front surface 101; the metal lead 110 includes a first bottom edge 111 and a second bottom edge 112; the length of the first bottom edge 111 is greater than that of the second bottom edge 112; first base 111 is approximately parallel to second base 112; the distance between the first bottom edge 111 and the bent front face 101 is smaller than the distance between the second bottom edge 112 and the bent front face 101. The display panel 100 faces one of the surfaces when bent, which is the bent front surface 101. The bent front 101 is located on a side of the display panel 100 away from the substrate 10. The length of the first base side 111 and the length of the second base side 112 refer to the dimension of the first base side 111 and the second base side 112 extending in the cross section of the metal lead 110.

The first and second

bottom edges

111, 112 of the metal leads 110 are such that the total buffer force 109 of the buffer layer 120 against the metal leads 110 is directed towards the front side 101 of the bend. When the display panel 100 is bent toward the bent front surface 101, the metal leads 110 generate a material stress 107 acting on themselves, and the material stress 107 is directed to the substrate 10. Meanwhile, the organic material 121 of the buffer layer 120 generates a first buffer force and a second buffer force on both sides of the metal wire 110. Since the length of the first base edge 111 is greater than the length of the second base edge 112, the combined total cushioning force 109 of the first cushioning force and the second cushioning force may be directed toward the folding front 101. Where the material stress 107 is directed toward the substrate 10, the total cushioning force 109 may be directed toward the bend front 101 in approximately opposite directions. If the total buffer force 109 is approximately equal in magnitude to the material stress 107, the total buffer force 109 may counteract the material stress 107. This relieves the material stress 107 to the bent and deformed metal lead 110, and prevents the metal lead 110 from being broken due to the material stress 107.

As shown in fig. 1, the metal lead 110 further includes a first oblique side 113 and a second oblique side 114 in a straight shape; the first oblique edge 113 and the second oblique edge 114 connect the first bottom edge 111 and the second bottom edge 112; the first bottom edge 111, the second bottom edge 112, the first oblique edge 113 and the second oblique edge 114 form a trapezoidal structure; the first bottom edge 111 and the first oblique edge 113 form a first included angle 115, and the first bottom edge 111 and the second oblique edge 113 form a second included angle 116; the first included angle 115 and the second included angle 116 are 20 to 80 degrees.

The magnitude of the total buffer force 109 of the buffer layer 120 to the metal leads 110 can be adjusted according to the first included angle 115 and the second included angle 116 of the trapezoid structure. When the display panel 100 is bent toward the bent front surface 101, the metal leads 110 generate a material stress 107 acting on themselves, and the material stress 107 is directed to the substrate 10. Meanwhile, the organic material 121 of the buffer layer 120 generates a first buffer force and a second buffer force on the two sides to act on the first bevel 113 and the second bevel 114, and the total buffer force 109 combined by the first buffer force and the second buffer force is directed to the bending front 101. Wherein, the total damping force 109 is related to the first included angle 115 and the second included angle 116. The angle of the first included angle 115 and the angle of the second included angle 116 determine the magnitude of the total damping force 109. If the angles of the first included angle 115 and the second included angle 116 are appropriate, the total damping force 109 and the material stress 107 are approximately cancelled out. This relieves the metal lead 110 from the material stress 107 that it is bent and deformed.

As shown in fig. 1, the length of the first oblique side 113 of the metal lead 110 is approximately equal to the length of the second oblique side 114; the first included angle 115 of the metal lead 110 is approximately equal to the second included angle 116. The first bottom edge 411, the second bottom edge 112, the first oblique edge 113, and the second oblique edge 114 form an isosceles trapezoid structure, wherein the first bottom edge 111 and the second bottom edge 112 form two bottoms of the isosceles trapezoid structure, and the first oblique edge 113 and the second oblique edge 114 form two waists of the isosceles trapezoid structure. The length of the first oblique side 113 and the length of the second oblique side 114 refer to the dimension of the first oblique side 113 and the second oblique side 114 extending in the cross section of the metal lead 110.

The isosceles trapezoid structure can make the first and second buffering forces of the buffer layer 120 on the first and second

oblique sides

113 and 114 approximately symmetrical with respect to the metal lead 110, which helps to keep the metal lead 110 in a balanced stress. When the display panel 100 is bent toward the bent front surface 101, the metal leads 110 generate a material stress 107 acting on themselves, and the material stress 107 is directed to the substrate 10. Meanwhile, the organic material 121 of the buffer layer 120 generates a first buffer force and a second buffer force on the two sides to act on the first bevel 113 and the second bevel 114, and the total buffer force 109 combined by the first buffer force and the second buffer force is directed to the bending front 101. Wherein the first cushioning force, the second cushioning force, and the total cushioning force 109 are associated with a first angled side 113, a second angled side 114, a first included angle 115, and a second included angle 116. The same length of the first 113 and second 114 hypotenuses results in the combined total cushioning force 109 of the first cushioning force and the second cushioning force being directed towards the folded front face 101 and approximately canceling in a direction perpendicular to the folded front face 101. If the angles of the first included angle 115 and the second included angle 116 are appropriate, the total damping force 109 and the material stress 107 are approximately cancelled out. This relieves the metal lead 110 from the material stress 107 that it is bent and deformed.

Fig. 5 is a schematic cross-sectional view of a display panel 500 in a bending region according to another embodiment of the invention. The display panel 500 includes metal leads 510. The metal lead 510 includes a first oblique side 513, a second oblique side 514, a first included angle 515, and a second included angle 516. The length of the first angled edge 513 is less than the length of the second angled edge 514; the first included angle 515 is 10 to 60 degrees greater than the second included angle 516. The metal lead 510 in the display panel 500 further includes a first bottom edge 511 and a second bottom edge 512. The first bottom edge 511, the second bottom edge 512, the first oblique edge 513 and the second oblique edge 514 form a non-isosceles trapezoid structure, wherein the first bottom edge 511 and the second bottom edge 512 form two bottoms of the non-isosceles trapezoid structure, and the first oblique edge 513 and the second oblique edge 514 form two waists of the non-isosceles trapezoid structure. First base edge 511 forms a first included angle 515 with first oblique edge 513, first base edge 511 forms a second included angle 516 with second oblique edge 514, and first included angle 515 and second included angle 516 are acute angles and have different angles. The angle of the first included angle 515, the angle of the second included angle 516 may be 20 degrees to 80 degrees, and the angle of the first included angle 515 may be 10 degrees to 60 degrees greater than the angle of the second included angle 516. The second bottom edge 512 forms a third included angle 517 with the first oblique edge 513, the second bottom edge 512 forms a fourth included angle 518 with the second oblique edge 514, and the third included angle 517 and the fourth included angle 518 are obtuse angles and have different angles. The first and second

sloped sides

513, 514 are in close contact with the organic material 521. The non-isosceles trapezoid structure of the metal lead 510 can relieve the material stress to which the bent and deformed metal lead 510 is subjected. The length of the first angled side 513 and the length of the second angled side 514 refer to the dimension of the first angled side 513 and the second angled side 514 extending within the cross-section of the metal lead 510.

When the display panel 500 is bent toward the side of the bent front surface 501, the metal leads 510 generate a material stress 507 acting on themselves, and the material stress 507 may be directed toward the substrate 50 or parallel to the substrate 50. Meanwhile, the organic material 521 generates a first damping force and a second damping force acting on the first inclined edge 513 and the second inclined edge 514, and the first damping force and the second damping force are combined into a total damping force 509. The total cushioning force 509 may be directed toward the bend front 501 or parallel to the bend front 501. Wherein the first cushioning force, the second cushioning force, and the total cushioning force 509 are associated with a first angled side 513, a second angled side 514, a first included angle 515, and a second included angle 516. If first angled edge 513, second angled edge 514, first included angle 515, second included angle 516 are appropriate, then total cushioning force 509 approximately cancels out material stress 507. This relieves the material stress 507 to which the bent and deformed metal lead 510 is subjected.

Fig. 6 is a schematic cross-sectional view of a display panel 600 in a bending region according to another embodiment of the invention. The display panel 600 includes metal leads 610. The metal lead 610 includes a first oblique side 613 and a second oblique side 614 in a circular arc shape; the first and second

oblique sides

613, 614 have approximately the same arc and radius of curvature; the first oblique edge 613 and the second oblique edge 614 connect the first bottom edge 611 and the second bottom edge 612 of the metal lead 610; the first bottom edge 611, the second bottom edge 612, the first oblique edge 613 and the second oblique edge 614 form a quadrilateral structure. The first bottom edge 611 and the second bottom edge 612 form two bottom portions of the quadrilateral structure, and the first oblique edge 613 and the second oblique edge 614 form two side portions of the quadrilateral structure. The first base edge 611 forms a first included angle 615 with the first oblique edge 613, the first base edge 611 forms a second included angle 616 with the second oblique edge 614, and the first included angle 615 and the second included angle 616 are acute angles and have the same angle. The angle of first included angle 615 and the angle of second included angle 616 may be 20 to 80 degrees. Second base 612 forms a third included angle 617 with first oblique side 613, second base 612 forms a fourth included angle 618 with second oblique side 614, and third included angle 617 and fourth included angle 618 are both obtuse angles and have the same angle. The first oblique side 613 and the second oblique side 614 are in close contact with the organic material 621. The quadrilateral structure of the metal lead 610 may relieve the material stress to which the bent and deformed metal lead 610 is subjected.

The stress directions of the arc edges of the first oblique edge 613 and the second oblique edge 614 are dispersed, and the first buffering force and the second buffering force at the first oblique edge 613 and the second oblique edge 614 act on a plurality of directions, so that the effect of relieving the material stress 607 can be improved. When the display panel 600 is bent toward the bent front surface 601, the metal wires 610 generate a material stress 607 to act on themselves, and the material stress 607 points to the substrate 60. Meanwhile, the organic material 621 generates a first buffer force and a second buffer force acting on the first inclined edge 613 and the second inclined edge 614, and a total buffer force 609 formed by the first buffer force and the second buffer force is directed to the bent front face 601. The first damping force, the second damping force, and the total damping force 609 are related to the first oblique side 613, the second oblique side 614, the first included angle 615, and the second included angle 616. If the first angled edge 613, the second angled edge 614, the first included angle 615, and the second included angle 616 are appropriate, the total cushioning force 609 approximately cancels out the material stress 607. This relieves the material stress 607 to which the bent and deformed metal lead 610 is subjected. The stress directions of the arc edges of the first oblique edge 613 and the second oblique edge 614 are dispersed, and the first buffer force and the second buffer force act in multiple directions, so that the effect of relieving the material stress 607 is better.

Fig. 7 is a schematic cross-sectional view of a display panel 700 in a bending region according to another embodiment of the invention. The display panel 700 includes metal leads 710. The metal lead 710 includes a straight shaped first bottom edge 711, a second bottom edge 712, a first hypotenuse 713, a second hypotenuse 714, a third hypotenuse 715, a fourth hypotenuse 716; the first bottom edge 711 is parallel to the second bottom edge 712, the first oblique edge 713 is parallel to the third oblique edge 715, and the second oblique edge 714 is parallel to the fourth oblique edge 716; the first oblique side 713 connects the fourth oblique side 716, the second oblique side 714 connects the third oblique side 715, the first oblique side 713 and the second oblique side 714 connect the first bottom side 711, and the third oblique side 715 and the fourth oblique side 716 connect the second bottom side 712; first bottom edge 711, second bottom edge 712, first hypotenuse 713, second hypotenuse 714, third hypotenuse 715, fourth hypotenuse 716 form a hexagonal structure; the included angle between the first bottom edge 711 and the first oblique edge 713, the included angle between the first bottom edge 711 and the second oblique edge 714, the included angle between the second bottom edge 712 and the third oblique edge 715, and the included angle between the second bottom edge 712 and the fourth oblique edge 716 are all obtuse angles. The display panel 700 may be bent toward the bent front surface 701, or may be bent toward the substrate 70. The hexagonal structure of the metal lead 710 may relieve the material stress to which the bent and deformed metal lead 710 is subjected.

When the display panel 700 is bent toward the bent front surface 701, the metal lead 710 generates a material stress 707 to act on itself, and the material stress 707 is directed to the substrate 70. Meanwhile, the organic material 721 generates a first and a second buffering force acting on the first and the

second bevel

713, 714, and the total buffering force 709 of the first and the second buffering forces is directed to the bending front 701. If the interior corners of the hexagonal structure are properly positioned, the total cushioning force 709 approximately cancels the material stress 707. When the display panel 700 is bent toward the substrate 70, the metal lead 710 generates a material stress 707 to act on itself, and the material stress 707 is directed to the bent front 701. Meanwhile, the organic material 721 generates a first and a second buffering force acting on the third and the fourth

sloped sides

715 and 716, and a total buffering force 709 of the first and the second buffering forces is directed toward the substrate 70. If the interior corners of the hexagonal structure are properly positioned, the total cushioning force 709 approximately cancels the material stress 707. This relieves the material stress 707 to which the bent and deformed metal lead 710 is subjected.

Fig. 8 is a schematic cross-sectional view of a display panel 800 in a bending region according to another embodiment of the invention. The display panel 800 includes a bending region 807. The bending zone 807 comprises a first bending zone 808 and a second bending zone 809, the maximum bending curvature of the first bending zone 808 being larger than the maximum bending curvature of the second bending zone 808. Inflection region 807 also includes a plurality of metal leads 810: a first metal lead 830 located at the first inflection region 808 and a second metal lead 840 located at the second inflection region 809. A plurality of metal leads 810 are disposed in the buffer layer 820. The first metal lead 830 has a first included angle 831 or a second included angle 832 with a first angle, and the second metal lead 840 has a first included angle 841 or a second included angle 842 with a second angle, wherein the first angle is smaller than the second angle. When the display panel 800 is bent, the first metal lead 830 generates a first material stress to act on itself, and the second metal lead 840 generates a second material stress to act on itself, where the first material stress is different from the second material stress. Meanwhile, the buffer layer 820 generates a first total buffer force acting on the first metal wire 830 and a second total buffer force acting on the second metal wire 840, and the first total buffer force and the second total buffer force are also different. The different first total buffer force and the second total buffer force can respectively offset the different first material stress and the second material stress.

Fig. 9 is a schematic cross-sectional view of a display panel 900 in a bending region according to another embodiment of the invention. The display panel 900 includes a bending region 907. The bending region 907 includes a first film 908 and a second film 909, and a distance between the first film 908 and the bending front 901 is greater than a distance between the second film 909 and the bending front 901. Inflection region 907 further includes a plurality of metal leads 910: a third metal lead 930 in the first film layer 908 and a fourth metal lead 940 in the second film layer 909. A plurality of metal leads 910 are disposed in the buffer layer 920. The third metal wire 930 has a first included angle 931 or a second included angle 932 of a third angle, and the fourth metal wire 940 has a first included angle 941 or a second included angle 942 of a fourth angle, wherein the third angle is smaller than the fourth angle. When the display panel 900 is bent, the third metal lead 930 generates a third material stress to act on itself, and the fourth metal lead 940 generates a fourth material stress to act on itself, where the third material stress is different from the fourth material stress. Meanwhile, the buffer layer 920 generates a third total buffer force acting on the third metal wire 930 and a fourth total buffer force acting on the fourth metal wire 940, and the third total buffer force is different from the fourth total buffer force. The third total buffer force and the fourth total buffer force which are different can respectively offset the third material stress and the fourth material stress which are different.

Fig. 10 is a schematic cross-sectional view of a display panel 1000 in a bending region according to another embodiment of the invention. Bending region 1007 includes a plurality of metal leads 1010: fifth and sixth metal leads 1030 and 1040, the cross-sectional area of fifth metal lead 1030 being greater than the cross-sectional area of sixth metal lead 1040. A plurality of metal leads 1010 are disposed in the buffer layer 1020. The fifth metal lead 1030 has a first included angle 1031 or a second included angle 1032 of a fifth angle, and the sixth metal lead 1040 has a first included angle 1041 or a second included angle 1042 of a sixth angle, where the fifth angle is smaller than the sixth angle. When the display panel 1000 is bent, the fifth metal lead 1030 generates a fifth material stress to act on itself, the sixth metal lead 1040 generates a sixth material stress to act on itself, and the fifth material stress is different from the sixth material stress. Meanwhile, the buffer layer 1020 generates a fifth total buffer force acting on the fifth metal lead 1030 and generates a sixth total buffer force acting on the sixth metal lead 1040, and the fifth total buffer force is different from the sixth total buffer force. The different fifth total cushioning force and the different sixth total cushioning force may counteract the different fifth material stress and the different sixth material stress, respectively.

Fig. 11 is a schematic diagram of a display device 1150 according to another embodiment of the invention. The display device 1150 includes a display panel 1100. The specific structure of the display panel 1100 has been described in detail in the above embodiments, and is not described herein again.

Fig. 12A and 12B are schematic diagrams illustrating a method for manufacturing a display panel according to another embodiment of the invention. The preparation method of the display panel comprises the following steps: (1) forming an organic material buffer layer in a bending area of the display panel; (2) forming a groove in the buffer layer through patterning of the buffer layer; (3) and forming a metal lead in the groove. As shown in fig. 12A, the step of forming the symmetrical grooves specifically includes: (1) forming a buffer layer 1201 on a substrate; (2) forming a photoresist layer 1202 on the buffer layer 1201 at the side far away from the substrate; (3) exposing and developing the photoresist layer 1202 by using a mask plate to form an opening 1203 with two symmetrical oblique edges, and adjusting the exposure time and the exposure light collimation degree to form a straight oblique edge, an arc oblique edge or oblique edges with various inclination angles; (4) the buffer layer 1201 is etched and the remaining photoresist is stripped, forming a groove 1204 having two symmetrical hypotenuses. As shown in fig. 12B, the step of forming the asymmetric groove specifically includes: (1) forming a buffer layer 1201 on a substrate; (2) forming a first photoresist layer 1202 on the buffer layer 1201 at the side far away from the substrate; (3) exposing and developing the first photoresist layer 1202 by using a mask plate to form an opening 1203 with a first inclined edge, wherein a straight inclined edge, an arc-shaped inclined edge or inclined edges with various inclination angles can be formed by adjusting exposure time and exposure light collimation; (4) etching the buffer layer 1201 and stripping the remaining photoresist to form a groove 1204 having a second bevel edge; (5) forming a second photoresist layer 1205 on the buffer layer 1201 and the groove 1204; (6) exposing and developing the second photoresist layer 1205 by using a mask plate to form an opening 1206 with a third bevel edge, and adjusting the exposure time and the exposure light collimation degree to form a straight bevel edge, an arc bevel edge or bevel edges with various inclination angles; (7) the buffer layer 1201 is etched and the remaining photoresist is stripped, forming a recess 1207 having a second bevel edge and a fourth bevel edge, the second bevel edge and the fourth bevel edge being asymmetric.

The technical scheme has the following beneficial effects: when the display panel bends towards one side of the bending front face, the metal lead generates material stress to act on the metal lead, and the material stress points to the bending back face. Meanwhile, the organic material of the buffer structure generates a first buffer force and a second buffer force which act on the first bevel edge and the second bevel edge, and the first buffer force and the second buffer force are combined into a total buffer force. The first buffer force, the second buffer force and the total buffer force are related to the first bevel edge, the second bevel edge, the first included angle and the second included angle. If the first oblique side, the second oblique side, the first included angle and the second included angle are proper, the total buffer force and the material stress are approximately offset. This relieves the metal leads of the buckling deformation from material stress. When the display panel is bent, the organic material of the buffer layer generates a total buffer force to act on the metal lead. If the grooves are arranged appropriately so that the total cushioning force is approximately equal in magnitude and opposite in direction to the material stress, the total cushioning force can counteract the material stress. Therefore, the material stress on the bent and deformed metal lead is relieved, and the metal lead is prevented from being broken due to the material stress. The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A display panel comprising a substrate, the display panel further comprising:

the display panel comprises a bending area, the buffer layer comprises a plurality of grooves in the bending area, and the metal leads are arranged in the grooves; the display panel further comprises a bent front face;

the metal lead comprises a first bottom edge and a second bottom edge which are in straight shapes;

the length of the first bottom edge is greater than that of the second bottom edge;

the first bottom edge is approximately parallel to the second bottom edge;

the distance between the first bottom edge and the bent front face is smaller than the distance between the second bottom edge and the bent front face;

the metal lead further comprises a first bevel edge and a second bevel edge in a straight shape;

the first oblique edge and the second oblique edge are connected with the first bottom edge and the second bottom edge;

the first bottom edge, the second bottom edge, the first bevel edge and the second bevel edge form a trapezoidal structure;

the first bottom edge and the first bevel edge form a first included angle, and the first bottom edge and the second bevel edge form a second included angle;

the first included angle and the second included angle are 20-80 degrees;

the length of the first oblique side is approximately equal to the length of the second oblique side;

the first included angle is approximately equal to the second included angle;

the metal leads comprise a fifth metal lead and a sixth metal lead, and the cross-sectional area of the fifth metal lead is larger than that of the sixth metal lead;

the first included angle or the second included angle of the fifth metal lead is a fifth angle;

the first included angle or the second included angle of the sixth metal lead is a sixth angle;

the fifth angle is less than the sixth angle.

2. The display panel according to claim 1, wherein the bending region comprises a first bending region and a second bending region, and a maximum bending curvature of the first bending region is greater than a maximum bending curvature of the second bending region;

the metal lead comprises a first metal lead positioned in the first bending area and a second metal lead positioned in the second bending area;

the first included angle or the second included angle of the first metal lead is a first angle;

the first included angle or the second included angle of the second metal lead is a second angle;

the first angle is less than the second angle.

3. The display panel according to claim 1, wherein the bending region comprises a first conductive layer and a second conductive layer, and a distance between the first conductive layer and the bending front surface is larger than a distance between the second conductive layer and the bending front surface;

the metal leads comprise a third metal lead positioned on the first conductive layer and a fourth metal lead positioned on the second conductive layer;

the first included angle or the second included angle of the third metal lead is a third angle;

the first included angle or the second included angle of the fourth metal lead is a fourth angle;

the third angle is less than the fourth angle.

4. The display panel according to claim 1, wherein the substrate is made of a polyimide material.

5. A display device characterized by comprising the display panel according to any one of claims 1 to 4.